<template>
    <div class="upload-file">
        <el-upload
            multiple
            :action="uploadFileUrl"
            :before-upload="handleBeforeUpload"
            :file-list="fileList"
            :limit="limit"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            :on-success="handleUploadSuccess"
            :show-file-list="false"
            :headers="headers"
            class="upload-file-uploader"
            ref="upload"
            :disabled="disabled"
            v-if="!disabled"
        >
            <!-- 上传按钮 -->
            <el-button size="mini" type="primary">选取文件</el-button>
            <!-- 上传提示 -->
            <div class="el-upload__tip" slot="tip" v-if="showTip">
                请上传
                <template v-if="fileSize">
                    大小不超过 <b style="color: #f56c6c">10MB</b></template
                >
                <template v-if="fileType">
                    格式为 <b style="color: #f56c6c">pdf</b></template
                >
                的文件
            </div>
        </el-upload>

        <!-- 文件列表 -->
        <transition-group
            class="upload-file-list el-upload-list el-upload-list--text"
            name="el-fade-in-linear"
            tag="ul"
        >
            <li
                :key="file.url"
                class="el-upload-list__item ele-upload-list__item-content"
                v-for="(file, index) in fileList"
            >
                <div class="fileAndDel">
                    <el-link
                        :href="`${baseUrl}${file.url}`"
                        :underline="false"
                        target="_blank"
                    >
                        <el-image
                            style="width: 100px; height: 100px"
                            :src="getFileImage(file.name)"
                            fit="fill"
                        ></el-image>
                    </el-link>
                    <div
                        class="ele-upload-list__item-content-action"
                        v-if="!disabled"
                    >
                        <el-link
                            :underline="false"
                            @click="handleDelete(index)"
                            type="danger"
                            style="width: 50px"
                        >
                            删除
                        </el-link>
                    </div>
                </div>
                <div class="el-icon-document elipsis">
                    {{ getFileName(file.name) }}
                </div>
            </li>
        </transition-group>
    </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
    name: "FileUpload",
    props: {
        // 值
        value: [String, Object, Array],
        // 数量限制
        limit: {
            type: Number,
            default: 5,
        },
        // 大小限制(MB)
        fileSize: {
            type: Number,
            default: 5,
        },
        // 文件类型, 例如['png', 'jpg', 'jpeg']
        fileType: {
            type: Array,
            default: () => [
                "doc",
                "docx",
                "xls",
                "xlsx",
                "ppt",
                "txt",
                "pdf",
                "mp3",
                "mp4",
                "wmv",
                "rmvb",
                "mkv",
            ],
        },
        // 是否显示提示
        isShowTip: {
            type: Boolean,
            default: true,
        },
        // 是否禁用
        disabled: {
            type: Boolean,
            default: false,
        },
    },
    data() {
        return {
            number: 0,
            uploadList: [],
            baseUrl: process.env.VUE_APP_BASE_API,
            uploadFileUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 通用上传文件
            headers: {
                Authorization: "Bearer " + getToken(),
            },
            fileList: [],
        };
    },
    watch: {
        value: {
            handler(val) {
                if (val) {
                    let temp = 1;
                    // 首先将值转为数组
                    const list = Array.isArray(val)
                        ? val
                        : this.value.split(",");
                    // 然后将数组转为对象数组
                    this.fileList = list.map((item) => {
                        if (typeof item === "string") {
                            item = { name: item, url: item };
                        }
                        item.uid = item.uid || new Date().getTime() + temp++;
                        return item;
                    });
                } else {
                    this.fileList = [];
                    return [];
                }
            },
            deep: true,
            immediate: true,
        },
    },
    computed: {
        // 是否显示提示
        showTip() {
            return this.isShowTip && (this.fileType || this.fileSize);
        },
    },
    methods: {
        //  获取文件缩略图
        getFileImage(name) {
            let ext = this.getFileExt(name);
            console.log("文件扩展名为：" + ext);
            if (ext) {
                let lowExt = ext.toLowerCase();
                if (lowExt == "doc" || lowExt == "docx") {
                    return require("@/assets/images/am/filext/DOC.png");
                } else if (lowExt == "pdf") {
                    return require("@/assets/images/am/filext/PDF.png");
                } else if (lowExt == "ppt") {
                    return require("@/assets/images/am/filext/PPT.png");
                } else if (lowExt == "psd") {
                    return require("@/assets/images/am/filext/PSD.png");
                } else if (lowExt == "txt") {
                    return require("@/assets/images/am/filext/TXT.png");
                } else if (lowExt == "vsd") {
                    return require("@/assets/images/am/filext/VSD.png");
                } else if (lowExt == "xmap") {
                    return require("@/assets/images/am/filext/XMAP.png");
                } else if (lowExt == "ys") {
                    return require("@/assets/images/am/filext/YS.png");
                } else if (lowExt == "ai") {
                    return require("@/assets/images/am/filext/AI.png");
                } else if (
                    lowExt == "mp3" ||
                    lowExt == "mp4" ||
                    lowExt == "wmv" ||
                    lowExt == "rmvb" ||
                    lowExt == "mkv" ||
                    lowExt == "avi"
                ) {
                    return require("@/assets/images/am/filext/VIDEO.png");
                } else if (lowExt == "xls" || lowExt == "xlsx") {
                    return require("@/assets/images/am/filext/ELX.png");
                } else if (lowExt == "rar" || lowExt == "zip") {
                    return require("@/assets/images/am/filext/RAR.png");
                } else {
                    return require("@/assets/images/am/filext/FILE.png");
                }
            }
        },
        // 上传前校检格式和大小
        handleBeforeUpload(file) {
            // 校检文件类型
            if (this.fileType) {
                let fileExtension = "";
                if (file.name.lastIndexOf(".") > -1) {
                    fileExtension = file.name.slice(
                        file.name.lastIndexOf(".") + 1
                    );
                }
                const isTypeOk = this.fileType.some((type) => {
                    if (file.type.indexOf(type) > -1) return true;
                    // docx上传会被doc校验控制住
                    // if (fileExtension && fileExtension.indexOf(type) > -1) return true;
                    if (fileExtension && fileExtension == type) return true;
                    return false;
                });
                if (!isTypeOk) {
                    this.$modal.msgError(
                        `文件格式不正确, 请上传${this.fileType.join(
                            "/"
                        )}格式文件!`
                    );
                    return false;
                }
            }
            // 校检文件大小
            if (this.fileSize) {
                const isLt = file.size / 1024 / 1024 < this.fileSize;
                if (!isLt) {
                    this.$modal.msgError(
                        `上传文件大小不能超过 ${this.fileSize} MB!`
                    );
                    return false;
                }
            }
            this.$modal.loading("正在上传文件，请稍候...");
            this.number++;
            return true;
        },
        // 文件个数超出
        handleExceed() {
            this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
        },
        // 上传失败
        handleUploadError(err) {
            this.$modal.msgError("上传图片失败，请重试");
            this.$modal.closeLoading();
        },
        // 上传成功回调
        handleUploadSuccess(res) {
            this.uploadList.push({ name: res.fileName, url: res.fileName });
            if (this.uploadList.length === this.number) {
                this.fileList = this.fileList.concat(this.uploadList);
                this.uploadList = [];
                this.number = 0;
                this.$emit("input", this.listToString(this.fileList));
                this.$modal.closeLoading();
            }
        },
        // 删除文件
        handleDelete(index) {
            this.fileList.splice(index, 1);
            this.$emit("input", this.listToString(this.fileList));
        },
        // 获取文件名称
        getFileName(name) {
            if (name.lastIndexOf("/") > -1) {
                return name.slice(name.lastIndexOf("/") + 1);
            } else {
                return "";
            }
        },
        // 获取扩展名
        getFileExt(name) {
            let n = this.getFileName(name);
            let ar = n.split(".");
            return ar[ar.length - 1];
        },
        // 对象转成指定字符串分隔
        listToString(list, separator) {
            let strs = "";
            separator = separator || ",";
            for (let i in list) {
                strs += list[i].url + separator;
            }
            return strs != "" ? strs.substr(0, strs.length - 1) : "";
        },
    },
};
</script>

<style scoped lang="scss">
.upload-file-uploader {
    margin-bottom: 5px;
}

.upload-file-list {
    display: flex;
}

.el-icon-document {
    width: 100%;
    padding: 5px 10px;
}

.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    margin-right: 10px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    .fileAndDel {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
    }
}

.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
    max-width: 150px;
}

.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}

.el-upload-list__item:first-child {
    margin-top: 5px;
}
</style>
